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Technical Specification ITB 2011-023 Lot # 1

Emergency Water Supply Project in Beit Hanoun Area

in Gaza Strip

" Construction of Khadeja Storage Tank, Well And

Water Booster Pumping Stations at Beit Hanoun Water

Storage Tank"

GENERAL AND PARTICULAR

(TECHNICAL)SPECIFICATIONS

ENGINEERING &MANAGEMENT CONSULTING CENTRE


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A) General Specifications

1.

SCOPE OF THE WORK

These specification cover the construction of water booster pumping station, the reconfiguration ofKhadija Well and new ground reinforced concrete water storage tank ( Khadija ST ) located inBeit Hanoun at Khadija well site.The booster station (Khadija BS) composed of three pumps (two in duty and other standby),designed to discharge 220 m3/hr for each pump, at a total dynamic head of 35 m. The boosterpumping station is fed directly from Khadeja water Storage Tank (Eastern zone of Beit Hanoun).

The capacity of the tank is 3000 m3 (25.0m diameter and 6.8m total height), circular type. The

storage tank is designed to provide continuous supply for eastern zone of Beit Hanoun locality.The storage tank is fed directly from Khadija, Ayda, Abu Ghazala, Tika (ALfarata) water wellsthrough 14 steel pipe.

The scope of this contract includes:

1)

Construction of the storage tank and all concrete works related to piping systemand mechanical equipment.

2)

Construction of the pumps room, service building, generator, fuel storage tank andall concrete works related to mechanical and electrical equipment.

3) Reconfigure and rehabilitate of Khadija water wells. The works include civil,mechanical and electrical works.

4) Supply and install the equipment and machinery including, pumps with electricmotors, electric panels with required control devices, electric generator unit, fueltank and piping, pipes and fittings, connecting the pipes to the existing systems.

A.DEFINITIONS

Wherever the words defined in this section or pronouns used in their stead occur in the ContractDocuments, they shall have the meanings herein given.Wherever in the Contract Documents, or on the Drawings, the words "as directed", "as described","as ordered", "as requested", "as required", "as permitted", or words of like import are used, itshall be understood that the direction, description, order, request, requirements or permission of

the Engineer is intended. Similarly, the words "approval", "description", "order", and "request".

2. TENDER DRAWINGS

A number of Contract Drawings available at the date of Tender is included in the list of Drawingsattached to these Specifications. All work shall be performed in accordance with the Drawingsfurnished together with the Contract Documents and any such additional drawings as may beissued by the Engineer from time to time during the progress of the work. Additional drawings (ifany) will be furnished to the Contractor in due time so as to enable him to perform the work shownthereon in proper sequence and for any advance planning that may be necessary for the efficientperformance of such work. The Engineer will decide in such instance whether additional drawingsare required for advance planning of the works and determine the time required for doing so.

3.

SHOP DRAWINGS


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If at any time before the commencement or during the progress of the work it appears to theEngineer that for the proper execution of a specific part of the Works, shop Drawings arenecessary, these Drawings shall be prepared by the Contractor at his own expense and submitted tothe Engineer for approval. On the other hand, the Engineer shall have authority to order at anytime and the Contractor shall agree to provide at his own expense any number of shop Drawingswhich, in the opinion of the Engineer are necessary for the proper execution of a specified Work.The Contractor shall not proceed with the above-mentioned work unless these shop Drawings areapproved by the Engineer.

4. AS-BUILT DRAWINGS

All prints of the Drawings, where required, shall be corrected by the Contractor and submitted tothe Engineer for approval as the Works proceed. Upon the completion of the Works, theContractor shall prepare a completely new set of Drawings for the project as executed and submitsame in duplicate to the Engineer for approval. When approved by the Engineer, the Contractorshall submit one digital on CD and three copies of all Drawings duly marked "As-Built". The final

payment shall not be made except for the actual works that have been complete in accordance withthe Specifications and have been duly presented on the "As-Built Drawings". The Contractor shallnot be entitled to any extra payment or extension of time for the correction, preparation andsupplying of the mentioned drawings.

5. ABBREVIATIONS OF STANDARDS

The following abbreviations covering the Standards used for the Works under the Contract shallhave the significance set forth opposite each:BS British Standards SpecificationsCP British Standard Codes of Practice

ASTM American Society for Testing and MaterialsACI American Concrete InstituteISO International Organization for SpecificationLS Local Standards

6. STANDARDS

The Works have been designed to incorporate and utilize economically goods, materials andworkmanship to various specifications which are detailed herein. Reference is commonly made toBritish Standards (BS) and Local Standard (LS) and to the American Society for Testing andMaterials Standards (ASTM). Different national or international standards (DIN or ISO etc.) that

correspond to the specified Standard may be used provided that their requirements are not lessstringent, and provided that the Contractor presents copies of such Standards translated intoEnglish. If any redesign of the Works is necessitated by the adoption of such alternatives the costsincurred shall be born by the Contractor. Those references shall in every case be deemed toinclude the latest edition or issue of such Standards.

7. APPROVED

This word when applied by the Engineer to the Contractor's drawings or documents shall meanthat the drawings or documents are satisfactory from the standpoint of interfacing withContractor's furnished components of the installations, and/or that the Engineer has not observed

any statement or feature that appears to deviate from the Specification's requirements. Except for


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the interfacing with the Contractor's furnished components, the Contractor shall retain the entireresponsibility for complete conformance with all of the Specifications requirements.

8. INCONSISTENCY IN CONTRACT DOCUMENTS

The Contractor shall execute the Works according to the provisions of the Contract Documents.Any work indicated in one of the documents but omitted and/or not stated in one or more of theother documents shall be treated as though it were included in all of them.If any two documents of the Contract conflict as to the quantity of the work to be carried out, thediscrepancy shall be brought to the notice of the Engineer, who shall instruct the Contractor whichof the two conflicting documents to regard as correct.If the Contractor shall discover that any work has been omitted and/or not indicated entirely orpartially from all the documents, but that such work is essential to the safety or proper functioningof the works, he shall report the facts immediately to the Engineer. If the work is something whichin the opinion of the Engineer could not have been foreseen by an experienced Contractor, theEngineer shall issue to the Contractor a variation order stipulating the details of the work to bedone. No additional payment shall be made in respect of work carried out in connection with

discrepancies between the various Contract Documents.

9. ERRORS IN COMPUTING CONTRACT DOCUMENTS

The Contractor shall be responsible for any error which he makes in computing any quantities ofmaterial and labor required or costs involved or through any lack of knowledge of the Site, ormisunderstanding of anything shown or implied on the Drawings or in the Specifications and/orthe Bills of Quantities.

The Contractor must refer any discrepancy in the Drawings or the Specifications to the Engineerbefore proceeding in any of the Works. The decision of the Engineer as to the interpretation of the

discrepancy will be final.

Any item or items of work not specifically shown on the Drawings or referred to in theSpecifications but which, would be necessary for the proper construction of the Works inaccordance with the best practice is implied and must be included for as incidental to the ContractPrice.

Any item for which the Contractor has not inserted a price in the Bills of Quantities shall bedeemed to be covered by other prices of rates therein.

10. CONTRACTOR'S RESPONSIBILITY

The Contractor shall bear, at his own cost and expense the full and entire responsibility for thesufficiency of plant, center, scaffolding, false work timbering, machinery, tools labor, etc. andgenerally for all means used for the execution and fulfillment of this Contract whether suchmeans may or may not be approved or recommended by the Engineer.

Notwithstanding any minimum requirements included in this specification regarding quantity,output and adequacy of plant or outline of methods, the attaining of the specified standards ofquality of work shall be the sole responsibility of the Contractor.

11.

TEMPORARY WORKS AND REINSTATEMENT


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The Contractor shall provide and maintain all temporary access roads and tracks necessary formovement of plant and materials and clear same away at completion and make good all Worksdamaged or disturbed.

The Contractor shall submit drawings and full particulars of all Temporary Works to theEngineer before commencing same. The Engineer may require modifications to be made if heconsiders them to be insufficient and the Contractor shall give effect to such modifications butshall not be relieved of his responsibilities for the sufficiency thereof.The Contractor shall provide and maintain weatherproof sheds for storage of materials pertinentto the Works both for his own use and for the use of the Employer and clear same away at thecompletion of the Works.The Contractor shall divert as required, at his own cost and to the approval of the Engineer, allpublic utilities encountered during the progress of the Works, except those specially indicated onthe Drawings as being included in the Contract.Where diversions of services are not required in connection with the permanent Works, theContractor shall uphold, maintain and keep the same in working order in existing locations.The Contractor shall make good, at his own expense, all damage to telephone, telegraph and

electric cables or wires, sewers, water, or other pipes, except where the Public Authority or PrivateParty owning or responsible for the same elects to make good the damage. The cost incurred in sodoing shall be paid by the Contractor to the Public Authority or Private Party on demand.All injury to the surface of the land, to the beds of watercourses, projecting banks, etc., wheredisturbed by the Works (other than where specifically ordered by the Engineer) shall be repairedby the Contractor or the Authorities concerned, at the Contractors expense. All such making goodshall be to the approval of the Engineer.The requirements detailed above shall be provided and maintained at the expense of the Contractor.The Employer shall not be liable for loss or injury to any Temporary Works.

12. EXISTING FACILITIES

The existing facilities must be kept in continuous operation throughout the construction period. Nointerruption will be permitted which adversely affects the degree of service provided. Providedpermission is obtained from Employer via Engineer in advance, portions of the existing facilitiesmay be taken out of service for short periods corresponding to periods of minimum servicedemands. Such permission will not relieve the Contractor of any of his responsibilities under thisContract.The cost of work and materials required in the construction and subsequent removal of temporarycrossings and bypasses of all existing Utilities roads, pipes, channels and cables and in thereinstatement of all such utilities shall be included by the contractor in the unit rates for therespective items of work for which such crossings are required.

13. RELOCATION OF ELECTRIC AND TELEPHONE POLES

The Contractor shall transfer interfering electric and telephone poles to the new required locations.Work shall include dismantling and re-fixing of the electric and telephone cables, supplying andinstalling any shortage of conductors or necessary fittings and accessories. The work shall beexecuted as directed by the Engineer or his representative and in full coordination with the- properauthorities.

14. SUBSURFACE STRUCTURES AND ALL UTILITIES

Before beginning work operations, the Contractor shall contact the local municipalities andutilities and notify them of his intention to begin work operations.


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The Drawings may show and Specifications may discuss certain structures or facilities believed toexist in the working area, the exact location of which may vary from the locations indicated. TheDrawings may not show all water lines, underground electric conduits or aboveground electricfacilities, underground telephone conduits or aboveground telephone facilities, undergroundcesspools and other sanitary facilities, all of which are known to exist in the area. There may becertain other facilities and utilities in the Work area not listed above or not shown on theDrawings, including septic tanks and service connections that must remain in service.

It shall be the responsibility of the Contractor to determine the exact location of such pipelines,subsurface structures and/or utilities ahead of his work by exploratory excavation or other meansand to take suitable precautions to prevent damage to them and to prevent interruption of theservices which such facilities provide. If they are broken or damaged, they shall be restored by theContractor or the appropriate utility at the Contractors expense.

When water lines, sewers drains, other pipelines, subsurface structures and/or utilities are in closeproximity to the Work and they must be removed, relocated or altered in any way, the Work shall

be in strict accordance with the requirements and specifications of the owner of said facilities.

In addition, the Contractor shall pay particular attention to poles, pole lines, overhead wires and all

other facilities aboveground that may be in conflict with the Work. The Contractor shall followthe same procedures outlined herein for underground facilities.

15. SAFETY OF ADJOINING EXISTING BUILDINGS

The Contractor shall take all necessary precautions during the excavation for the Worksparticularly those excavations which are adjoining existing buildings and shall protect thesebuildings from damage or collapse by means of temporary or permanent shoring, strutting, sheet

piling or underpinning or excavation in short length and/or other methods as he deems fit. Also, heshall properly support all foundations, trenches, walls, floors, etc., affecting the safety of the

adjoining existing buildings.

The Contractor shall keep the Engineer informed as to the manner in which he intends to proceedwith the execution of the excavations and obtain his approval, such approval if given shall notabsolve the Contractor of his responsibility under this clause.The Contractor shall save harmless and indemnify the Employer in respect of all claims, demands,proceedings, damages, costs, charges and expense whatsoever arising out of or in relation to anysuch matters in so far as the Contractor is responsible under this clause.

16.

WATCHING

The Contractor shall allow for all necessary watching for the security of the Works and theprotection of the public, including shelter and fuel for any watchman as required.

17. WATER AND ELECTRICAL POWER FOR THE WORKS

The Contractor shall provide all necessary water and electrical power and lighting for the Works,with all temporary plumbing and storage, pay all charges, and alter, adapt and maintain temporary

work as necessary and remove and make good at completion.


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18. MEDICAL FACILITIES

The Contractor shall arrange for medical attention to be available when necessary and shallprovide all adequate first aid equipment within easy access of each Works area on the site. TheContractor shall display in suitable places the names of his employees who are available from time

to time to render first aid. The Contractor shall provide for the transport of serious cases to thenearest hospital.

19.

SPECIFIED MANUFACTURERS PRODUCTS

Manufacturers name or catalogue number, if shown in the Specification or indicated on theDrawings, are given only for indicative purposes and for general reference only. It shall beunderstood that the actual material supplied shall meet the requirements of the Specifications, andif necessary, the material specified under such manufacturers name or catalogue indicated forreference, shall be modified under the direction of the Engineer.

20.

ALTERNATIVE MATERIALS

Should the Contractor wish to offer alternative items or materials to those specified he shall supplydetails of such alternatives together with details of any reduction in the Contract Price should thealternative be allowed to be substitute for the specified items or materials. All offered alternativesshall comply fully in all respects with the Specifications of the particular items or materials.Acceptance or refusal of such alternatives will be entirely at the discretion of the Engineer.If during the course of the Contract certain materials or items required for use in the Works shouldbe unobtainable, despite the best effort of the Contractor, the Contractor may offer for the approvalof the Engineer alternative materials or items, provided that they possess the minimumrequirements of the originally specified material.In the event of acceptance of any alternative materials or items a suitable price reduction shall bemade in respect of any decrease in value but no price addition shall be made in respect of increasein value.In the event of refusal of any alternative materials or items the Contractor shall not be relieved ofany of his obligations under the Contract and shall be solely liable for any delay or loss occasionedby his failure to provide the material or items as specified.

21. IMPORTED MATERIALS

The Contractor is required to produce documentary evidence that all imported materials or itemshave been ordered shortly after the Site is handed over for the commencement of the Works. This

means materials or items that have to be ordered from abroad. As soon as orders have been placed,copies or such orders shall be submitted to the Engineer.Consequently, no claim will be considered for extension of the Contract Period due to non-availability of materials.

22. PERIODIC REPORTS

The Contractor must present to the Engineers Representative detailed reports and schedules asstipulated in the Conditions of Contract.The Contractor shall prove to the Engineers Representative upon his request the correctness of theabove mentioned reports without having the right to use such documents to support a claim for any

extra payment or compensation whatsoever in regard or in relation to such reports.


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23. SITE PROGRESS MEETINGS

During the course of the work, site progress meetings shall be held at regular intervals at least onceevery two weeks in the presence of the Engineer for the purpose of coordinating the ContractorsWorks and to ensure that full compliance with the various sequences of the contract are

maintained. Minutes of such site meetings will be recorded, copies will be distributed to allpersons concerned and full effect shall be given to all instructions contained herein.

Prior to such meetings the contractor shall give to the Engineers Representative details in writingof that portion of the Works he proposes to construct during the coming two weeks with details ofthe plant and methods he proposes to employ. These proposals shall be discussed at the meeting andno work based on such proposal shall proceed without the approval of the Engineers representative.

The Contractor shall have no claim against the Employer for costs incurred by him in changing themethod of working or in the provision and use of other additional plant.

24.

CANCELLATION DUE TO SLOW PROGRESS

If the Engineer shall be of the opinion that having regard to the state of the Works at any time, thecontractor will be unable to complete any section of the Works by the time specified or by suchextension thereof as he may be entitled to under the Contract and the contractor has failed to carryout steps and to expedite the work in accordance with the conditions of Contract or, if theEngineer is of the opinion that such steps are inadequate, the Engineer may, by written order omitthe whole or any part of the uncompleted work included in that section and the Employer shall beat liberty to execute such omitted work by his own workmen or by other contractors. If the cost ofsuch omitted or uncompleted work shall exceed the sum which would have been payable to thecontractor on due completion of the said work, then the Contractor shall, upon demand, pay to theEmployer the amount of such excess and it shall be deemed a debt due by the contractor to the

Employer and shall be recoverable accordingly.

25. CARE OF THE WORKS

The Contractor shall keep all persons (including those employed by sub-Contractors) undercontrol and within the boundaries of the Site. He will be held responsible for the care of theexisting premises and of the works generally until their completion, including all work executedand materials, goods and plant (including those of sub-Contractors and Suppliers) deposited on theSite; together with all risks arising from the weather, carelessness of work people, damage or lossby theft or any other cause; and he shall make good at his own expense all such damage and loss.

26. PROTECTION FROM WEATHER AND FLOODS

The Contractor shall keep the Works well drained until the Engineer certifies that the whole of theWorks is substantially complete and shall ensure that so far as is practicable all Work is carried outin the dry. Excavated areas shall be kept well drained and free from standing water.

The Contractor shall construct, operate and maintain all temporary dams, watercourses and otherworks of all kinds including pumping and well point dewatering plant that may be necessary toexclude water from the Works while construction is in progress. Such temporary works and plant

shall not be removed without the approval of the Engineers Representative.


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Notwithstanding any approval by the Engineer of the Contractors arrangements for the exclusionof water, the Contractor shall be responsible for the sufficiency thereof and for keeping the Workssafe at all times particularly during any floods and for making good at his own expense anydamage to the Works including any that may be attributable to flood. Any loss of production oradditional costs of any kind that may result from floods shall be at the Contractors own risk.

27.

CLEARING AWAY

The Contractor shall take down and clear away all plant, temporary works, including sheds, messroom, sanitary conveniences, offices, latrines, sign-boards, and other temporary works, unlessotherwise described, and make good.

The Contractor shall remove all existing rubbish and debris and surplus materials from the site asthey accumulate and at completion; and clean all surfaces, including those of affected portions ofthe existing premises, internally and externally, remove stains and touch up paint work and

polished work, and leave the works clean and to the satisfaction of the Engineer at completion.

28. ROADS TO BE KEPT CLEAN

The Contractor shall take great care and all reasonable precautions to ensure that roads andthrough fares used by him either for the construction of the Works or for the transport of plant,labor and materials are not dirtied as a result of such construction or transport and, in the event oftheir becoming thus dirtied in the opinion of the Engineers Representative the Contractor shalltake all necessary and immediate steps to clean them.

29.

PROJECT PLANNING AND SCHEDULING

The Contractor in accordance with the Conditions of Contract shall submit within 3 days of theacceptance of his Tender to the Engineer a detailed program of works showing the order ofprocedure and the method in which he proposes to carry out the Works. In preparing his programor work plan the Contractor shall pay due regard to the priority required by certain works. Shouldthe Engineer require the Contractor to modify his program of work, the Contractor shall forthwithsubmit a modified program incorporating such changes. Should the Engineer during the progressof work require further modifications to the program of work, the Contractor shall likewise reviewthe said program. The Contractor shall also whenever required by the Engineer or the EngineersRepresentative, submit particulars in writing of the Contractors arrangements for carrying out theworks and of the Constructional Plant and Temporary Works which the Contractor intends tosupply, use or construct as the case may be.

30.

TESTING ON COMPLETION

The Engineer may before issuing the Certificate of Completion require any part of the Works to betested for conformity with the Specification. Such tests shall be made at the Contractors expense.

31. INSPECTION

If work to be done away from the construction site is to be inspected on behalf of the Employerduring its fabrication, manufacture, or testing, or before shipment the Contractor shall give noticeto the Engineer of the place and time where such fabrication, manufacture, testing, or shipping isto be done. Such notice shall be in writing and delivered to the Engineer in ample time so that thenecessary arrangements for the inspection can be made.


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In respect of all items of equipment and materials to be imported for incorporation in thepermanent works the Contractor shall submit to the Engineers Representative in the Englishlanguage inspection and test reports issued in the country of origin and certified by andindependent inspector or inspection firm of international repute approved in advance by theEngineer. The reports shall certify that all such items are in full compliance with the Contractrequirements and specifications and shall be accompanied by full details of sampling, inspectionand test results. Each such report shall be submitted prior to the shipment of the related items tothe Site.

No extension of time on account of delays due to inspection shall be granted as such time as isneeded for inspection shall be considered in the schedule of the Works.

Material and equipment procured within the country for incorporation in the permanent worksshall be inspected at the place of origin by competent and experienced specialized personnelappointed by the Contractor and approved by the Engineer. Inspection and test reports certifyingthat the related item is in full compliance with the Contract requirements and specification shall besubmitted prior to its incorporation in the works.

The certification herein prescribed shall be submitted whether or not the Engineer or hisRepresentative has exercised the right to witness tests or make inspections at the point of origin.The Engineer shall be entitled to apply the Conditions of Contract in respect of items not socertified. Certification shall be furnished at the Contractors expense. It shall not relieve theContractor of the obligation to ensure that all material and workmanship incorporated in the worksshall be in full compliance with the Contract requirements and Specification at the time of finalhanding over of the completed works.

32.

SUPPRESSION OF NOISE AND POLLUTION

The Contractor shall make every reasonable endeavor both by means of temporary works and bythe use of particular plant or silencing devices to ensure that the level of noise or pollutionresulting from the execution of the Works does not constitute a nuisance.

The Contractor shall take all such precautions as may be necessary in the conduct of the work toavoid water pollution, air pollution, noise pollution harmful to health, spreading of plant diseasesand pests, or damage to natural resources or the environment, all as is consistent with goodpractice and as required by applicable laws, ordinances, and regulations or lawful orders ofauthority having jurisdiction.

33. PROTECTIVE EQUIPMENT AND CLOTHING

The Contractor shall provide and maintain all necessary protective and safety equipment andclothing for the operative and Site Staff.

34.

DELAYS AND NON-PRODUCTIVE TIME

The Contractor shall be deemed to have allowed for all delay caused by difficulty in obtaininglabor and materials or by suspension of part or the whole of the Works due to adverse andinclement weather conditions.The Contractor shall allow for all costs incurred by non-productive time.

35.

CLEANING UP


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During its progress the work and the adjacent areas affected thereby shall be kept cleaned up andall rubbish, surplus materials and unneeded equipment shall be removed, and all damage repairedso that the public and property owners will be inconvenienced as little as possible.

Where material or debris has washed or flowed into or been placed in existing watercourses,ditches, gutters, drains, pipes, structures, work done under this contract, or elsewhere during thecourse of the Contractors operations, such materials or debris shall be entirely removed andsatisfactorily disposed of during the progress of the work, and ditches, channels, drains, pipes,structures, and work, etc., shall, upon completion of the work, be left in a clean and neat condition.

The Contractor shall restore or replace, when and as directed, any public or private propertydamaged by his work, equipment, or employees, to condition at least equal to that existingimmediately prior to the beginning of operations. To this end the Contractor shall do as requiredall necessary highway or driveway, sidewalk, and landscaping work. Suitable materials,equipment, and methods shall be used for such restoration.

The Contractor shall thoroughly clean all materials and equipment installed by him and his sub-

Contractors, and on completion of the work shall deliver it undamaged and in fresh and new-appearing condition. All mechanical equipment shall be left fully charged with lubricant and readyfor operation.

36. PERMITS, LICENSES AND FEES

Unless otherwise indicated in these Contract Documents, the Contractor shall obtain and pay forall construction permits and licenses. Employer shall assist Contractor, when necessary, inobtaining such permits and licenses. Contractor shall pay all governmental charges and inspectionfees necessary for the prosecution of the Work. The Contractor shall also pay all charges of utilityservice companies for connections to the Work.

37.

ASSISTANCE TO THE ENGINEERS REPRESENTATIVE

The Contractor shall render such assistance and supply such labor as may be required by theEngineers Representative in connection with the Contract and when required.

Such labor shall be retained in the employ of the Contractor, but shall operate and perform theirduties under the direction of the Engineers Representative.

38. OFFICES FOR THE ENGINEER'S REPRESENTATIVE

The Contractor shall provide suitable site offices for the use of the Engineer's Representative andhis assistants, throughout the period of construction. The site offices shall be constructed in alocation approved by the Engineer's Representative during the mobilisation period. The officesshall be of fixed type and shall have walls, ceiling and partitions lined with Mansonite hardboardor similar material. All rooms shall have glazed windows complete with fly screens. Adequatefitted hardware, electrical switches, sockets, lighting, and plumbing fittings, sanitary ware andfittings and fixtures etc., shall be provided as necessary for the different areas.

The site offices shall be equipped, serviced and maintained in a clean, weatherproof and sanitarycondition. Each operational site shall be provided with one office.The electrical installation shall provide for simultaneous use of all electrical appliances.


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The Contractor shall arrange for a temporary power supply to the offices and provide and maintainadequate diesel generator sets. All electricity bills shall be paid by the Contractor.The Contractor may either arrange for a temporary main water supply or alternatively providetankered water supply.

Throughout the duration of the Contract, the Contractor shall ensure an uninterrupted supply ofwater and electricity to the offices.

The contractor shall cover phone calls of NIS 400 per month for two mobile phones.

The offices shall be completed and all the equipment provided by the Commencement of thePermanent Works.The Contractor shall provide all items listed in the attached Schedules.

Specific Requirements

1. The Contractor shall be responsible for making all arrangements and payments in respects of anyland required for the site of the office building.

2. The Contractor shall be responsible for the security of the building and its contents at all times,cover all the operation and maintenance costs for the building and equipment provided and shallemploy watchmen for this purpose.

3. The building shall become the property of the Contractor after the completion of the Works.4. All offices furniture shall remain the property of the Contractor and will be returned to the

contractor after the completion of the works.

SCHEDULE OF OFFICES

The requirements of the site offices on this contract are as follows:

Room No. Description Size Requirement

1 Inspector 4m x 3m2 Toilet 1.5m x 2m3 Kitchen 2m x 1.5m

SCHEDULE OF Furniture

The Furniture required under this contract for the site offices indicated in the schedule of officesshall be to the Engineers approval and are as follows:Item Description Quantity

a Desk with two locking 1drawers and chair

b Chair plastic covered, padded 4Steel frame

c Samples cupboard 1d Four drawers steel filing cabinet 1e In/out tray 1f Waste paper basket 1g 2 ring gas burner 1h Camera (Auto focus with 30-100 range 1

lens and date imprint facility)i Fan 1

* The Contractor shall be responsible for all fees, costs and telephone charges incurred by theEngineers representatives until the completion of the works.


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The costs for these items shall be included in the contractors unit prices.

39. SIGNBOARDS AND BOARDS

The contractor shall erect signboards and boards in prominent positions adjacent to the work to thesatisfaction of the engineer as per the attached sketch.

The materials of construction shall consist of the following:

Posts and Struts Timber or Galvanised steel tubes coated in extruded grey PVC

Foundations Concrete

Backboards Timber or ply, painted white wood

Signboards Plastic or other approved

Fixings By the Contractor

The Contractor shall be responsible for the structural design of all posts, struts, fixings andfoundations.

All the text and logo shall be dark blue on a white background.

The number of main signboards to be supplied are 1.

The Contractor shall allow for all associated costs in providing, erecting and relocation of thisnumber of signboards when entering an amount in the unit prices provided in the Bill ofQuantities.

In addition to the main signboards mentioned above, the contractor shall supply and install

portable two signboards 100x70 cm size and shall indicate names of (project, client, consultant,contractor and Municipality). The price of these signboards shall be included in the contractorsunit prices.

40. COMPUTER

The Contractor shall provide one computer and one laser printer as described below for the use ofthe Engineer's Representative and his assistants, throughout the period of construction Computershould meet the following specifications:

HP Compaq dc7800 Convertible Minitower

Microsoft Windows XP Professional SP2

Intel Pentium Dual core E2160 1 GB PC2-5300 (DDR2-667) 2x512

80 GB SATA NCQ HDD SMART IV

16X DVD+/- RW Drive (LS/DL/DF)

Video/graphics: ATI RNX300SE, 128 MB PCIE DVI.

Integrated Broadcom Gigabit NIC

3/3/3 (parts/labor/on-site)

17" Flat panel Screen.

Keyboard: Hp PS/2 Standard keyboard.

HP PS/2 2-Button Optical Scroll Mouse.

Power supply: 80PLUS PS - dc78 CMT Standard.

41. Minimum Contractor Staff and Salaries


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Beside labours and technicians, the minimum contractors staff should be as follows:

Project Manager 1

Site Engineer 1

Office boy 1

The minimum salaries of the contractors staff should be as follows:

Project Manager 25 US$

Site Engineer 20 US$

Office boy 12 US$

Technician 15 US$

Worker 12 US$


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B) Particular (Technical) Specifications

EARTHWORKS

1. SCOPE OF WORK

This section covers excavation and backfilling work and shall include the necessary clearing,grubbing and preparation of the site; removal and disposal of all debris; excavation as required; thehandling, storage, transportation and disposal of all excavated material; all necessary sheeting,shoring and protection work; preparation of sub-grades; pumping and dewatering as necessary orrequired; protection of adjacent property; backfilling; surfacing and grading; and other relatedworks.No classification of excavated materials will be made. Excavation work shall include the removaland subsequent handling of all materials excavated or otherwise removed in performance of thework, regardless of the type, character, composition or condition thereof.

2. SITE INVESTIGATION

The Contractor shall be deemed to have visited the site of Works and satisfied himself as to thenature of the ground and made himself conversant with the local conditions to be encounteredduring the execution of the Contract.

3. MATERIALS

Construction materials supplied by the Contractor shall include but not be limited to the following:

Backfill

Backfill and fill shall be structurally sound material such as sand or native soil free of rocks,lumps, vegetable and other organic materials, obtained from suitable excavated material and/orfrom approved borrow pits. The backfill shall be appropriate for the existing road or pavingconstruction to be reinstated as required.

Water shall be clean potable water free from injurious amounts of oil, acid or any otherdeleterious mineral and/or organic matter.

Concretefor thrust blocks, chambers, cover slabs or used as fill for making up to correct level andareas of over-excavation, shall have a characteristic strength as stipulated hereinafter.

4. SITE PREPARATION

Prior to commencing any excavation work, the Contractor shall establish a horizontal and verticalsurvey network, record existing ground elevations and stake the location to be excavated.

The Contractor shall prepare the site for construction by clearing, removing and disposing of allitems not indicated on the Drawings to remain or so defined by the Engineer.The Contractor shall obtain relevant excavation permits as required before commencing work.

Existing Utilities

The Contractor shall ascertain the whereabouts of all existing utilities on the site both, above and


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below ground.The Contractor shall be held responsible for all damages entailed on any of the utilities adjacent tothe site resulting from the Works.All proposed or existing utilities, including buried pipes, sewers, ducts, culverts, cesspits,chambers and the like, in the vicinity of the work site, are to be determined by the Contractor andthe location of them is to be shown on the as-built drawings.

Prior to commencement of excavation, the Contractor shall establish the number and location ofunderground utilities and chambers in the immediate proximity of the work.

Where necessary, the Contractor shall use hand tools to excavate test pits prior to excavation todetermine the exact locations of existing utilities. It shall be the responsibility of the Contractor tomake such explorations sufficiently in advance of construction to enable the engineer to approvemodifications, if any, to be made to the pipeline, structure or conflicting utility. The Contractorshall obtain the permission of the Engineer before commencing any test pits and shall fence, markand protect them, as required by the Engineer. Test pits shall be refilled by hand as soon aspracticable after the necessary information has been obtained.

As the excavation approach sewers conduits, cables or other underground facilities, the excavationshall be continued with care by means of hand tools. Where necessary, the Contractor shallprovide temporary support for the existing utilities to prevent damage during his operations.Notwithstanding these provisions, if damage to existing utilities results from the Contractor'soperations, such damage shall be repaired without delay by the Contractor to the Utility ownerssatisfaction.

If damage to existing utilities causes disruption to Contractor's schedule of work by delaying workin the area of such damage, the Contractor shall re-adjust his programme, methods of working andresources so that critical dates in the schedule for the completion of the Contract are not affected.This shall not be deemed to be an instructed acceleration.

Removal of Existing Structures and Other Obstructions

This work shall include, but not be limited to, the removal of existing structures and otherobstructions interfering with the Works. The salvaging of any of these materials for the use of theEmployer shall be as directed by the Engineer and unwanted materials shall be disposed off theSite in a satisfactory manner as directed by the Engineer.

Cleaning and Grubbing

The Contractor shall perform the clearing and grubbing (if any), of top soil consisting mainly of

loose soil, vegetable and organic matters, drift sand, unsuitable soil and rubbish by scarifying theareas to be excavated and sidewalks to a minimum depth of 300mm from the natural ground level.All materials resulting from the above operations shall be removed from the site, loaded and

transported and off loaded, spread and leveled to approved dumps.

5. SETTING-OUT

The Contractor shall stake-out the work as shown on the Drawings and secure the Engineer'sapproval of his stake-out before proceeding with construction. If, in the opinion of the Engineer,modification of the line or grade is advisable before or after stake-out, the Engineer will issuedetailed instructions in writing to the Contractor for such modification and the Contractor shall revisethe stake-out for further approval in accordance with the relevant Clause of the Conditions of

Contract.


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6. EXCAVATION

The Contractor shall perform all excavation true to line, width and depths shown on the Drawingsor to such further lines, depths or dimensions or to reach suitable bearing strata as may be directedby the Engineer.

Keeping Excavations Free from Water

All excavations shall be kept clear of water by pumping or bailing or by well-point de-watering,but the latter system shall not be employed if any danger exists of withdrawing water from thefoundations of the adjoining buildings and such water shall be discharged clear of the Works andthe method adopted shall in no way contravene with regulations of the Municipalities.

The system or systems to be employed shall be approved by the Engineer. Such approval if given,shall not waive the Contractor's responsibilities and liabilities under the Contract.

Particular attention shall be paid to the installation of sheeting and shoring as may be necessary forthe protection of the work and for the safety of personnel and public.

Storing of Suitable Excavated Material

During excavation, materials suitable for backfill shall be stockpiled on the site at adequatedistance from the sides of the excavation to avoid over-loading and prevent collapse of the trenchwalls.

Disposal of Unsuitable and Surplus Excavated Material

Upon the order of the Engineer, all unsuitable and surplus materials shall be immediately removed,loaded and transported off the site area by the Contractor to approved dumps and he shall abide bythe relevant local regulations.

7. SHEETING, SHORING AND BRACING

Except where banks are cut back on a stable slope, excavation shall be sheeted, braced and shoredas necessary to prevent collapse of the excavations. The Contractor shall furnish, put in place, andmaintain such sheeting, bracing, etc, as may be necessary to support the sides of the excavationand to prevent any movement of earth which could in any way diminish the width of theexcavation to less than that necessary for proper construction, or could otherwise injure or delaythe work, or endanger adjacent structures. If the Engineer's Representative is of the opinion that atany point sufficient proper supports have not been provided, he may order additional supports.

The Engineer may direct that sheeting and bracing be cut off at any specified elevation.

All sheeting and bracing not to be left in place shall be carefully removed in such manner as not toendanger the construction or other structures. All voids left or caused by the withdrawal ofsheeting shall be backfilled immediately with approved material and compacted by ramming withtools especially adapted to that purpose, by watering or by other means as may be directed.

8. EXCAVATION FOR STRUCTURES AND MANHOLES

Excavation for the structures and manholes shall be carried out to the dimensions, lines and gradesshown on the Drawings or required by the Engineer.

Should it appear that the bottom of the excavation does not provide a solid base for the chamber,the Contractor shall be required to consolidate the bottom using hand tampers and increasing the


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moisture content, if required, all as directed by the Engineer.Any over-excavation at the bottom of the structure and manholes shall be restored to the propergrade by filling the over-excavation with suitable material or shall be filled with concrete. In thecase of over-excavation in the walls, whether caused by careless work or by the necessity toprevent slides by excavating to a slope or for any other reason, the Contractor shall remove allloose material from the excavation, construct the walls of the structure to the dimensions shown onthe Drawings and fill the spaces between the structures and the sides of the excavation withcompacted backfill in layers of 15cm thickness. The material of the backfill shall be moistened ifnecessary and compacted to the level of the adjacent natural soil.

9. UNAUTHORIZED EXCAVATION

If the bottom of any excavation is taken out beyond the limits indicated or prescribed, the resultingvoid shall be backfilled at the Contractor's expense with thoroughly compacted, selected screenedgravel or sand fill as directed by the engineer if the excavation was for a pipeline, or with concreteif the excavation was for a structure or a manhole.

10. ELIMINATION OF UNSUITABLE MATERIAL

Suitable material shall comprise all material that is acceptable in accordance with the Contract foruse in the Works. Suitable material for earthworks shall be approved soil with a plasticity indexnot exceeding 6% obtained from excavations within the Works approved by the Engineer. It shallnot contain an excess of fines.

Unsuitable material shall be deemed to be:

Rock particles exceeding 75mm in size.

Organic material, stumps and other perishable material.

Material susceptible to spontaneous combustion.

Soils of liquid limit exceeding 40% and/or plasticity index exceeding 6%.

Any other material which the Engineer may deem to be unsuitable for earthwork.

If material unsuitable for foundation (in the opinion of the Engineer's Representative) is found ator below the grade to which excavation would normally be carried in accordance with theDrawings and/or structure, the Contractor shall remove such material to the required width anddepth and replace it with compacted, selected screened gravel, sand fill or concrete as directed bythe Engineer or his Representative.

11. DISPOSAL OF SURPLUS EXCAVATION MATERIALS

All surplus excavated materials shall be disposed of by the Contractor, except as otherwisedirected or approved by the Engineer.

12. BACKFILL

Backfill around Structures

The materials to be used for backfill around structures, shall be approved granular backfill materialobtained either from excavation for the structure and appurtenant Works, if it is approved by theEngineer or his representative, or from borrow pits cleaned and free of clay and stones as directedand specified hereinafter. The material used for backfill, the amount thereof, and the manner ofplacing shall be subject to direction of the Engineer or his representative. The backfill shall be

carried out to the lines and grades shown on the Drawings. The backfill material shall completelyand firmly fill the spaces between the excavation lines and the structure without leaving any voids


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and shall be compacted to the density of the adjacent natural or compacted earth or to 95% densityusing modified Proctor, whichever is greater. The backfill material shall be placed in horizontallayers not exceeding 15 cm in thickness after compaction.

The sides and bottom of the excavation shall be wetted before backfilling and so shall the backfillmaterial, in order to obtain the moisture content necessary for the required compaction. Everylayer shall be compacted by hand-operated and/or pneumatic tampers approved by the Engineer orhis representative for every specific case as suitable.

Backfill against foundation walls shall not be placed until obtaining the approval of the Engineeror his representative. The backfill shall be performed in a manner that will not create unbalancedpressure that could damage completed Work.

Backfill material may be placed in either a dry or a wet condition. Any material, which is in thebulking range of the moisture content of the material, shall be saturated before compaction. Nobackfill material shall be placed when free water is standing on the surface of the area where thebackfill is to be placed. No compaction of backfill will be permitted with free water on any portion

of the backfill to be compacted. Any backfill containing organic materials or other unacceptablematerial previously described shall be removed and replaced with approved backfill material priorto compaction.

Compaction of backfill shall be performed as specified, with equipment suitable for the type ofbackfill material being placed. The Contractor shall select equipment capable of providing theminimum density required by these Specifications or in cases where the compaction equipment isspecified, this specified equipment shall be used, and he shall submit information pertaining to theequipment to the Engineer or his representative for approval. Equipment shall be capable ofcompacting in restricted areas next to structures and around piping without damaging same.

Each lift of backfill material shall be compacted by at least two coverage of all portions of the

surface of each lift by approved compaction equipment. One coverage is defined as the conditionobtained when all portions of the surface of the backfill material have been subjected to the directcontact of the compacting surface of the compactor. The minimum density to be obtained incompacting select backfill shall be 95 percent of maximum density obtained in the laboratory inaccordance with ASTM D 1557. This percentage is of standard Proctor density. Compaction tests,soil analyses and any other laboratory tests necessary in the opinion of the Engineer or hisrepresentative for proper completion of the work shall be performed by the Contractor.

The water content of the fill shall be controlled during placement within the range necessary toobtain the compaction specified. In general, the moisture content of backfill soils shall be within 3percent of the optimum moisture content for compaction as determined by laboratory tests. Alllaboratory tests necessary to establish that the water content of the backfill is suitable forplacement shall be performed by the Engineer or his representative. The Contractor shall performall necessary work to adjust the water content of the backfill material to be within the rangenecessary to permit the compaction specified. This shall include, but not be limited to, spreading,scarifying and mixing to permit drying to reduce natural water contents to an acceptable range oradding water to increase the water content to an acceptable level.

The Contractor shall perform whatever tests he deems necessary to provide data for his selectionof backfill material and control of water content. Copies of a test results shall be furnished to theEngineer or his representative for his review.If the field and laboratory tests indicate unsatisfactory compaction, the Contractor shall providethe additional compaction necessary to obtain the specified degree of compaction. All additional

compaction work shall be performed and paid for by the Contractor until the specifiedcompactions is obtained. .


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If the specified densities are not being obtained because of the Contractor's improper control ofplacement or compaction procedures or because of improperly functioning compaction equipment,the Contractor shall perform whatever work is required to provide the specified densities. Thiswork shall include complete removal of unacceptable backfill areas and replacement and re-compaction until acceptable backfill is provided. All additional work to provide acceptablebackfill shall be performed and paid for by the Contractor. In-place density determinations shall bemade by an approved laboratory using a sand density cone or equivalent method as specified byASTM D1556.

Fill and Backfill under Structures

Unless otherwise indicated or specified, all fill and backfill under structures shall be compacted.The percentage of compacting for backfill shall be 98% of maximum density at optimum moisturecontent.

Tamping

Suitable material shall be deposited and spread in uniform, parallel layers not exceeding 15 cmthick before compacting. Before the next layer is placed, each layer shall be tamped as required soas to obtain a thoroughly compacted mass. The Contractor shall furnish and use an adequatenumber of power-driven tampers, each weighing at least 10kg for this purpose. Care shall be takenthat the material close to the bank, as well as in all other portions of the trench, is thoroughlycompacted.

To ensure proper compacting by tamping, the material shall first be wet by sprinkling. However nocompacting by tamping shall be done when the material is too wet either from rain or too great anapplication of water to be compacted properly; at such times the work shall be suspended until thepreviously placed and new materials have dried out sufficiently to permit proper compacting orsuch other precautions shall be taken as may be necessary to obtain proper compacting.

No superficial load shall be placed on the exposed surface of the trench unless the backfill, if ofnon-cohesive sand is vibrated or tamped in layers not exceeding 15 cm in depth until theEngineer's Representative is satisfied that sufficient settlement has occurred to alleviate live orimpact loads.

Backfilling for Pipelines

Backfilling of pipe trenches if any shall be done as practicable after the pipes have beensatisfactorily laid in position and jointed. The first stage of the backfill, from the bedding surfaceand up to 30 cm above the top of the pipe, shall consist of granular material as specified in the

subsection of Granular Backfillobtained from trench excavation or from borrow areas, free from,

stones, clods, and organic matter. This backfill shall be hand-tamped under and around the pipe inlayers not exceeding 15 cm in thickness after compaction, to a density not less than that requiredfor the subsequent backfill (at least 95% of modified Proctor).

The remainder of the pipe trench (second stage backfill from 30 cm above the pipe to the top of the trench)

shall be backfilled with selected excavated material or imported material as specified in thesubsection of Select Backfill, and shall be placed in layers not exceeding 20 cm thickness aftercompaction, wetted as necessary and compacted to a density not less than that of the adjacentmaterial or compacted soil (at least 95% of modified Proctor).

Granular Backfill


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The material shall consist of natural silica sand subject to approval of the Engineer or hisrepresentative, other inert materials with similar characteristics having durable particles. Materialsfrom different sources of supply shall not be mixed or stored in the same pile nor used alternatelyin the same class of construction without permission from the Engineer or his representative. Thegranular material shall be uniformly graded and shall meet the following gradation requirements.

Sieve designation Passing square-Mesh Sieves Percentages by Weight( AASHOT T 27)

3/8" 100

No. 4 95-100

No. 16 45-80

No. 50 10-30

No. 100 2-10

The material shall not contain deleterious substances in excess of the following percentages:

AASHTOTest Method

Percentage by Weight

Clay Lumps T 112 1

Coal and Lignite T 113 1

Material passing sieve No. 200 T 11 3

Total deleterious substances including the above and shale, alkali, mica, coated grains, and softand flaky particles shall not exceed 5 percent by weight.The placing, compacting and testing of granular backfill shall conform to applicable requirementsfor select backfill as specified herein except as noted above.

The Contractor shall submit to the Engineer or his representative samples of proposed GranularBackfill. The proposed material must receive the approval of the Engineer or his representativeprior to using it on the Project. The Contractor will be permitted to use excess materials from thetrench provided that they conform to the above requirements.

Select Backfill

Select backfill shall be placed as shown and specified or where directed by the Engineer or hisrepresentative. All materials used as select backfill shall consist of well-graded clean sand or sandand gravel meeting the following gradation requirements:

Sieve Size Percent Passing by Weight1" 100

No.4 0-40

No.200 0-10

No material containing pieces of wood or other organic matters or having lumps, pockets orconcentrations of silt or clay will be accepted. Samples of proposed backfill material should besubmitted to the Engineer or his representative for testing and approval prior to using the backfill.The contractor shall certify that for samples submitted, sufficient similar material is available tocomplete the Works. No backfill shall be placed at the site without approval by the Engineer or hisrepresentative. The Engineer or his representative shall be permitted to access borrow pits at alltimes for purposes of inspection.


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Prior to placement of select backfill, the surface of the subgrade shall be leveled and shall becompacted with two complete coverages using equipment approved for backfill placement. TheEngineer or his representative shall approve the subgrade prior to backfill placement. All backfillshall be placed in horizontal loose lifts not exceeding the thickness specified in previous sectionand shall be mixed and spread in a manner assuring uniform lift thickness after placing. Each layerof backfill shall be properly compacted as specified herein before placement of the following lift.

Gravel or Crushed Stone BackfillGravel or crushed stone backfill shall consist of gravel, crushed stone, crushed rock, materialsands, manufactured sands or combination thereof, and shall conform to the following gradationrequirements:

Screening size Percentage passing by Weight

2" 100

No. 4 30-100

No. 40 0-30

No. 200 0-5

The portion of the backfill passing the No.4 screen shall have a sand equivalent of not less than 60percent.Gravel or crushed stone backfill shall be placed as shown specified or where directed by theEngineer or his representative.

Gravel or crushed stone shall be spread in layers of uniform thickness not exceeding 20 cm andshall be thoroughly compacted with suitable power driven tampers or other power drivenequipment. The placing, compacting and testing of gravel or crushed stone shall conform toapplicable requirements for select backfill as specified herein except as noted above.

The Contractor shall submit to the Engineer or his representative samples of proposed gravel orcrushed stone backfill. The proposed material must receive the approval of the Engineer or hisrepresentative prior to using of it on the project. The Contractor will be permitted to use excessmaterials from the trench provided that they conform to the above requirements.

Miscellaneous Requirements

Whatever method of compacting backfill is used, care shall be taken that stones and lumps shallnot become nested and that all voids between stones shall be completely filled with fine material.The Contractor shall, as part of the work done under the items involving earth excavation and rockexcavation as appropriate, furnish and place all other necessary backfill material.

All voids left by the removal of sheeting shall be completely backfilled with suitable materialsthoroughly compacted.

When required, excavated material which is acceptable to the Engineer for surfacing or pavementsub-base shall be placed at the top of the backfill to such depths as may be specified elsewhere oras directed. The surface shall be brought to the required grade and stones raked out and removed.

Measurements and Payments

The payments for excavation for structures shall be in cubic meters. The volume of the excavationto be paid to the contractor shall be calculated based on the actual dimensions of the structure plus

2ms from each side if excavation depth is more than 3ms from GL. For structures with excavationdepth less than 3ms from GL, the volume of excavation shall be the actual dimension of the


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structure plus 1m from each side.The calculation of backfill volume shall be the same as the excavation minus the volume of thestructure.

The payment for excavation and backfilling of pipes and manholes shall be included in the unitrates of pipes and manholes.


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CONCRETE WORKS

1. GENERAL

Concrete work shall consist of furnishing all materials and constructing structures of the forms,

shapes and dimensions shown on the Drawings or as directed, using Portland Cement Concrete, inaccordance with the details shown on the Drawings and these Specifications.Portland cement concrete shall consist of a mixture of Portland Cement, fine aggregate, coarseaggregate, water and additives when required. The mixture shall be proportioned, mixed, placedand cured in accordance with the requirements of B.S. 8110 Part 1:1985 Sections 6 and 7specification. Where an additional clause conflicts or is inconsistent with the requirements of B.S.8110, the additional clause shall always prevail. The concrete mixes shall be designed mixes forspecial or ordinary concrete as defined in B.S. 8110 Clause 6.3, the design requirements of whichare laid down in this Specification.

2. MATERIALS

General Requirements

The classes of concrete and their respective minimum cement content, consistencies and theminimum required compressive strengths shall be as shown:

Comp. Strength Slump Min. Cement Max. Free(N/mm) (mm) Content w/c Ratio

Class 7 days 28 days (kg/m)

A (30/20) 20 30 25 - 75 350 0.55B (25/20) 17 25 25 - 75 300 0.6

C (15/20) 10 15 25 - 100 200 0.7

3. FINE AGGREGATE FOR CONCRETE AND MORTAR

Fine aggregate for concrete shall consist of natural screened and washed sand or crushed sandhaving hard and durable particles, or of other inert materials with similar characteristics. It shallnot contain harmful material such as clay lumps, tree roots, shale, iron pyrites, coal, mica, organicmatter or any deleterious matter which may attack the reinforcement, in such a form or insufficient quantity to affect adversely the strength and durability of the concrete. If necessary theaggregate shall be washed and sieved to remove the deleterious substances.The fine aggregate shall comply in all respects with the requirements of B.S. 882.

Fine aggregate of fine grading (BS 882) shall not be used. In addition to the above, fine concreteaggregate shall meet the following requirements:

Fineness Modulus, - Max. +/- 0.2 variance from test sampleSodium Sulphate Soundness, - Max. 10 %Clay and Friable Particles, - Max. 1% by weightTest for Organic Impurities - Lighter than standardMaterial Passing 0.075 mm sieve - Max. 3%Chlorides (Cl), BS 812, part 117 - Max. 0.06% by weight of fine (acid soluble) aggregateSulphate (SO3), BS 812, part 118 -Max. 0.3% by weight of fine(acid soluble) aggregate Sand Equivalent, - Min. 75Fine concrete aggregate shall conform to one of the following grading (reproduced from BS882):


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BS 410 Percentage by Weight Passing BS SieveTest Sieve

(mm) Coarse Medium

10 100 100

5 100 1002.36 60 -100 65 - 1001.18 30 - 90 45 - 1000.6 15 - 54 25 - 800.3 5 - 40 5-480.15 0 - 15 0 - 15

4. COARSE AGGREGATE FOR CONCRETE

Coarse aggregate for concrete shall consist of natural gravel, crushed gravel, or crushed stone, freefrom coating of clay or other deleterious substances. It shall not contain harmful materials such as

pyrites, coal, mica, laminated materials, tree roots, shale, or any materials which may attack thereinforcement, in such a form or in sufficient quantity to affect adversely the strength anddurability of the concrete. If necessary, coarse aggregate shall be washed to remove deleterioussubstances.The aggregate shall comply in all respects with the requirements of B.S. 882. The aggregate shallalso fulfil the following requirements:

Flakiness Index (37.5 mm) B.S. 812 0 - 40%Flakiness Index (20 mm) B.S. 812 0 - 20%Elongation Index (20 mm) B.S. 812 0 - 35%In addition to the above, coarse concrete aggregate shall meet the following requirements:

Sodium Sulphate Soundness - Max. 10% lossAbrasion, - Max. 40% lossClay lumps and Friable Particles - Max. 0.25 % by weightSoft Fragments and Shale - Max. 3% by weight BS. 812Passing 0.075 mm, - Max. 1%Chlorides (Cl) BS 812, Part 117 -Max. 0.02% by weight of(acid soluble)Coarse AggregateSulphates (SO3) BS 812, Part 118 -Max. 0.3% by weight of(acid soluble) Coarse AggregateWater Absorption - Max. 2%

The coarse aggregate shall conform to the following grading in accordance with the nominal sizeof aggregate specified (reproduced from BS 882).

BS 410 Nominal Size of Single-Size Aggregate

Sieve Percentage by weight passing BS Sievemm 40mm 20mm 14mm 10mm

50 100 - - -37.5 85-100 100 - -

20.0 0-25 85-100 100 -

14.0 - - 85-100 10010.0 0-5 0-25 0-50 85-100

5.0 - 0-5 0-10 0-25

- - - - 0-5

Combined Aggregate - Approved coarse aggregate and fine concrete aggregate in each batch ofconcrete shall be combined in proportions as specified in BS.882 and as approved by the Engineer.

However, in no case shall materials passing the 0.075 mm sieve exceed three (3) percent byweight of the combined aggregate.


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For the overall concrete mix the following controls of salts contents of aggregates shall beadopted:Chlorides (Cl) Max. 0.3% by weight of cementSulphates (SO3) Max. 4% by weight of cement

The combined concrete aggregate gradation used in the work shall be as specified, except whenotherwise approved or directed by the Engineer. Changes from one gradation to another shall notbe made during the progress of the work unless approved by the Engineer.

Naturally occurring sand/gravel mixtures (all in aggregates) shall not be used unless otherwisedirected by the Engineer.

5. WATER

Water for washing aggregate and for mixing of concrete shall be fresh, clean and substantially freefrom oil, acids, alkali, sewage, deleterious mineral or organic matter. It shall not contain chloridessuch as sodium chloride in excess of 600 ppm nor sulphites such as sodium sulphate in excess of

500 ppm. It shall comply in all respects with B.S. 3148.Water for curing concrete shall not have a pH lower than 5 or more than 7.5 nor contain impuritiesin sufficient amounts to cause discoloration of the concrete. Sources of water shall be maintainedat such depth and the water shall be withdrawn in such a manner as to exclude silt, mud, grass andother foreign matter.

Approval of Source - All sources of water for use with cement shall be approved by the Engineer.

If at any time during construction the water from an approved source becomes unsatisfactory, theContractor will be required to provide satisfactory water from some other source.

6. CEMENT

General

The cement shall be of approved manufacture and shall be delivered in bags with seals unbroken,or delivered in bulk, it shall be delivered in approved containers. Test certificates from themanufacturers or suppliers shall be submitted for each consignment and shall indicate the resultsof the tests for compressive strength, setting time, soundness and fineness carried out inaccordance with the requirements of the relevant ASTM or British Standards. Further tests may berequired by the Engineer after the cement is delivered and stored on the Site. The failure of anysample to satisfy the B.S. or ASTM requirements shall entitle the Engineer to reject the entireconsignment from which it was taken. Cement should be stored on the site such a way to keep itaway from water at all times. Sulphate Resisting Cement shall be used unless otherwise directed.

Portland Cement

Normal and rapid hardening cement shall comply with B.S.12.Sulphate Resisting CementSulphate resisting cement shall comply with B.S. 4027.

Admixtures

Air entraining agents, plasticizers, water proofing agents, retarders, and other similar admixturesshall comply with British Standard Specifications (5075, 8110, 1014, 3587, 3892) and shall beused in accordance with the manufacturers recommendations and B.S. Samples of proposedadmixtures shall, if required, be submitted to an approved testing authority by the Contractor inorder to ascertain its suitability for use in the Works. Use of any admixtures must be approved


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before hand by the Engineer.The cost of such admixtures shall be included in the cost of concrete and no extra payment shall bemade if they are used. The proportions of cement, fine aggregate and water shall be determined bythe Contractor before concreting commences and submitted together with such test results as maybe required to the Engineer for approval and the Contractor shall not commence concreting beforesuch approval is given nor shall he alter or vary in any way the proportion of mix unless hesubmits fresh test results and mix proportions to the Engineer for approval.

The approval by the Engineer of such mix designs does not in any way absolve the Contractor ofany of the requirements of the Specifications.

7. MIXING AND TESTING

Samples of Aggregates

Samples of both fine and coarse aggregates are to be submitted to the Engineer for testing at leastone week before commencing deliveries. No deliveries in bulk are to be commenced until such

samples are approved by the Engineer as complying with this Specification.

Trial Mixes

Following the engineers approval of the materials for each class of concrete, the Contractor shallprepare a trial mix of each grade of concrete in the presence of the Engineer Representative. Eachtrial mix shall comprise not less than 1/3 of a cubic meter of concrete and shall be mixed in anapproved type of concrete mixer similar to that which the Contractor propose to employ on theWorks. The quantities of all ingredients of trial mix including water shall be carefully determinedby weight according to the approved mix design. Each trial mix shall show no tendency tosegregate when handled and compacted by the methods by which the Contractor proposes tohandle and compact the grade of concrete in the Works and it shall be capable of adequate

compaction by such methods.

Water/Cement Ratio

The quantity of water to be added to the cement and aggregates during mixing shall be justsufficient to produce a workable mix to enable it to be well compacted and worked into corners offormwork and around reinforcement. All mixes shall be designed in respect of the proportioning ofwater so that the Slump Test as carried out according to B.S.1881 shall be in accordance with theslump specification. Measurement of water on the site shall take into account the moisture presentin the aggregates, and Slump Tests shall be taken sufficiently frequently to ensure that variationsin the moisture content of the aggregate are fully taken into account in determining the amount of

water to be added.

Measurement of Ingredients

The aggregates for the concrete shall be measured by weight but measurement by volume may beallowed in special circumstances with approval of the Engineer.

When the aggregates are to be measured by weight the weight batching machines shall be of a typeapproved by the Engineers Representative. They shall be kept clean and in good condition andadjustment. At intervals as the Engineers Representative may require, the Contractor shall checkthe accuracy of each weight-batching machine.

When the aggregates are to be measured by volume, the proportions of fine and coarse aggregatesshall be measured in well constructed gauge boxes, of dimensions approved by the Engineers


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Representative to guarantee that whole multiples of such gauge boxes will ensure the use of one ormore whole bags or containers of cement and the capacity of the concrete mixer shall be such as toensure that no splitting of cement bags or containers is required. Gauge boxes shall be properlyfilled and struck off level, addition of fine aggregates to allow for bulking due to moisture contentbeing made as required.An efficient water measuring device shall be fitted to each concrete mixer. Any cement containershall be such as to contain an accurately weighed amount of cement.

Mixing Concrete

The concrete shall be mixed in a power driven machine of the batch type, no hand mixing shall bepermitted. Mixing shall continue until the mass of concrete batch is uniform in consistency andcolour. The method of discharge shall be such as to cause no segregation of the concretematerials.Concrete which has commenced to set before placement shall not be re-mixed and shall be rejectedand in no case used in the works.

Concrete Testing - Compressive Crushing Strength

One set of three test cubes (15cm x 15cm x 15 cm) shall be taken from each 6 cubic metre batch orone set of three test cubes for each individual concrete member (anchor block) if the concrete isbatched individually. The cubes shall be cured in water at ambient air temperature. One cube shallbe tested at 7 days and the other two at 28 days. The compressive strength shall be deemed to bethe average strength value obtained from the two cubes crushed at 28 days. The result of the 7-daycube compressive strength shall act as an early warning indicator that the 28 day strength may notbe achieved. Where the specified 28-day strength is not achieved the Contractor shall replace thedefective concrete member at his own cost.

Concrete Testing - Workability

The contractor shall carry out slump tests on each separate concrete batch or delivery andadditional slump tests every one hour on the same batch or delivery if the time for placing concreteexceeds one hour. The cost of slump tests is deemed to be included in the cost for providing andplacing concrete.

Concrete Testing - Materials

The Contractor shall also obtain and furnish the Engineer with current Material Test Certificatesfrom the concrete supplier or otherwise for the following parameters;

Grading, fine and coarse aggregateFlakiness and Elongation IndexCompacting Factor TestCo-efficient of expansion for the aggregatesAbsorption IndexMix Design.

8. TRANSPORTING CONCRETE

Concrete shall be taken from the place of mixing to the place of deposition by methods which shallprevent the segregation or loss of the ingredients and which are sufficiently rapid to ensure that theconcrete does not commence to set before it is compacted in position. The concrete shall bedeposited as near as possible to its final position in the works and shall not be allowed to flowlaterally into position. Deposition of the concrete through shutes shall not be permitted nor


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dropped freely from a height exceeding 1.50m.

9. PLACING CONCRETE - GENERAL

Concrete shall not be placed without the Engineers approval. The approval shall be given onsatisfactory completion of checking by the Contractor and the Engineers Representative, whichshall include the following;

- Extent of the foundation and preparation,- Character of the bearing surface preparation,- Correct alignment, placing and cover to reinforcement,- Overall cleanliness.

The concrete shall be placed in its final position as soon as possible after it has been mixed, and inany case before the initial set has taken place. The Contractor shall ensure that concrete, which hasalready been placed in position and has commenced to set is not disturbed by the placing andcompaction of further concrete nearby. All concrete shall be carefully worked around and between

reinforcement and all other embedded fittings without such reinforcement or fittings beingdisturbed. Concrete is to be worked well up against whatever surface it joins.

Suitable measures shall be taken by the Contractor to ensure that concrete placed in hot weatherconditions shall not impair the quality or strength of the final installed concrete. Due regard shallbe paid to ambient and mix temperatures. Surfaces and forms prepared to receive the concreteshall be shaded wherever practicable and moistened with water to prevent drying out of theconcrete coming into contact with hot surfaces or reinforcement.

10. COMPACTING CONCRETE

Tamping

All concrete shall be thoroughly compacted to the maximum with approved tampers without anysegregation in its final position before it commences to set. Care shall be taken to avoid the use ofspade type tampers, which may cause segregation. Initial compaction shall be with tampers andcompaction with screed boards shall be limited to final shape and finish. During the placing andcompaction of reinforced concrete, a competent steel fixer shall be in attendance to adjust andcorrect if necessary the position of the reinforcement.

Vibrating

Concrete shall be compacted by vibrating with an approved vibrator. The vibrators shall not beattached to any reinforcement or embedded fittings and where immersion type vibrators are used,care shall be taken to ensure that they do not come into contact with the reinforcement orembedded fittings. Freshly placed concrete shall not be vibrated in a manner likely to causedamage to concrete, which has already begun its initial set. Concrete shall not be vibratedexcessively where segregation would result. Shutter type vibrators shall not be used. Nor shallimmersion type vibrators come into contact with the formwork.

11. CURING OF CONCRETE

All concrete shall be protected from the harmful effects of sunshine, drying winds, rain, flowingwater, or other adverse effects. For at least 7 days after placing, the concrete shall be preventedfrom drying out by being sprayed with water and covered with hessian, clean sand or otherapproved material, which shall be kept wet.


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Membrane curing of concrete with an approved liquid may be used as an alternative to curing withwater except that membrane curing liquid shall not be applied to surfaces of concrete from whichthe shuttering has been struck, until the concrete surface and finish has been inspected andapproved by the Engineer.

Concrete curing compound shall be readily distinguishable upon the concrete surface for at leastfour hours after the application. The colour, if any, shall be inconspicuous on exposed surfaceswithin seven days after application.

The contractor shall ensure that the concrete is adequately protected against inclement weatheruntil properly set and shall if necessary provide additional protection to that specified above.

12. INSPECTION OF CONCRETE

The condition of formed surfaces shall be inspected immediately on striking the shuttering by theContractor and Engineers Representative, for the presence of defects. Any remedial actionapproved by the Engineers Representative, such as application of cement slurry or mortar to

superficial defects, shall be carried out immediately while the concrete surface is still moist andbefore any curing membrane is applied.

13. DEFECTIVE CONCRETE

The Contractor shall on the written instruction of the Engineers Representative remove andreconstruct any portion of the work which in the opinion of the Engineers Representative isunsatisfactory as regards the quality of concrete, incorrect dimension or position of the castconcrete, badly placed or insufficient reinforcement, honeycombing or other such cause as torender the construction defective or non compliant with the specification or which mayprejudicially affect the strength or durability of the construction.

14. REPAIRS TO CONCRETE

The method of repairing and replacing defective concrete, which the contractor proposes to adopt,shall be submitted to the Engineers Representative for prior approval and the repair shall becarried out in such manner as he may direct or approve.

15. SUPERVISION OF CONCRETE WORK

Throughout the progress of the concrete work the Contractor shall employ and provide suchsupervision as is necessary to ensure the following:

- The day to day control of the quality of the concrete;- The mixing, transporting, placing, compacting, curing and protection of the concrete;- The testing of concrete and material constituents specified;- Investigation of defects as required by the Engineer; and- Preparation of all concreting records and reports as required by the Engineer.

16. FINISHING OF CONCRETE

All concrete surfaces not formed by shuttering shall be trawled to a smooth dense surface with theminimum of cement and fine particles being brought to the surface and shall be free fromirregularities.

Shuttered surfaces of concrete may be formed by casting against sawn timber. All other exposedconcrete including precast concrete shall be cast against steel, plywood or planed timber formwork


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and shall be carefully rubbed down with carborundum to remove all imperfections andirregularities.

17. DESIGN AND CONSTRUCTION OF FORMWORK

Formwork shall in every respect be adapted to the structure and the required surface finish of theconcrete. It shall include all temporary moulds for forming the concrete to the required shape andfinish for the support of such moulds. It shall be fixed in true alignment and securely wedged andbraced so as to be able to withstand, without displacement, deflection or movement of any kind,the weight of the construction and the movement of persons, materials and plant. Joints shall beclose enough to prevent the leakage of liquid and fine materials from the concrete.

The Engineers Representative may require at the prior submission for approval of theContractors proposals for the design and construction of formwork including supports. Theformwork shall be constructed so as to permit its removal without damage to the concrete.

18. SPACING BLOCKS AND TEMPORARY TIES

Internal spacing blocks and construction ties shall be avoided as far as possible and practicable.Where it is intended that these shall be removed whether before or after the concrete has set, themaking good of the concrete shall be subject to the Engineers Representatives approval. Theremoval of the blocks or internal ties must not jeopardise the stability of the construction. If, withthe approval of the Engineers Representative, these are allowed to remain in the concrete thenthey shall be of a material and quality that they do not prejudice the strength of the work. Concretespacing blocks shall be made of concrete at least equal in quality to the main concr

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